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Radical line of two ellipses

The equation of an ellipse with focal points $(a_1,b_1)$ and $(a_2,b_2)$ which passes through the point $(a_3,b_3)$ is given by the equation $$\begin{gathered} \sqrt{ (x-a_1)^2+(y-b_1)^2 } + \sqrt{ (x …
Benjamin L. Warren's user avatar